029通过UITabBarController选项卡实现不同界面之间的跳转

1 #import <UIKit/UIKit.h>
2 
3 @interface ViewController : UIViewController
4 @end

 1 #import "ViewController.h"
 2 
 3 @interface ViewController ()
 4 @end
 5 
 6 @implementation ViewController
 7 
 8 - (id)init {
 9     if (self = [super init]) {
10         //self.title = @"Hello";
11         UIImage *imgIcon = [UIImage imageNamed:@"Ball1.png"];
12         self.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"Hello" image:imgIcon tag:0];
13     }
14     return self;
15 }
16 
17 - (void)viewDidLoad {
18     [super viewDidLoad];
19     
20     UILabel* lblMessage = [[UILabel alloc] initWithFrame:self.view.bounds];
21     lblMessage.text = @"Hello, world!";
22     lblMessage.textAlignment = NSTextAlignmentCenter;
23     lblMessage.textColor = [UIColor blackColor];
24     lblMessage.backgroundColor = [UIColor whiteColor];
25     lblMessage.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
26     [self.view addSubview:lblMessage];
27 }
28 
29 - (void)didReceiveMemoryWarning {
30     [super didReceiveMemoryWarning];
31     // Dispose of any resources that can be recreated.
32 }
33 
34 @end

1 #import <UIKit/UIKit.h>
2 
3 @interface ViewController2 : UIViewController
4 @end

 1 #import "ViewController2.h"
 2 
 3 @interface ViewController2 ()
 4 @end
 5 
 6 @implementation ViewController2
 7 
 8 - (id)init {
 9     if (self = [super init]) {
10         //self.title = @"您好";
11         UIImage *imgIcon = [UIImage imageNamed:@"Ball2.png"];
12         self.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"您好" image:imgIcon tag:1];
13     }
14     return self;
15 }
16 
17 - (void)viewDidLoad {
18     [super viewDidLoad];
19     
20     UILabel* lblMessage = [[UILabel alloc] initWithFrame:self.view.bounds];
21     lblMessage.text = @"您好，世界！";
22     lblMessage.textAlignment = NSTextAlignmentCenter;
23     lblMessage.textColor = [UIColor whiteColor];
24     lblMessage.backgroundColor = [UIColor blackColor];
25     lblMessage.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
26     [self.view addSubview:lblMessage];
27 }
28 
29 - (void)didReceiveMemoryWarning {
30     [super didReceiveMemoryWarning];
31     // Dispose of any resources that can be recreated.
32 }
33 
34 @end

1 #import <UIKit/UIKit.h>
2 
3 @interface AppDelegate : UIResponder <UIApplicationDelegate>
4 @property (strong, nonatomic) UIWindow *window;
5 @property (strong, nonatomic) UITabBarController *tabBarController;
6 
7 @end

 1 #import "AppDelegate.h"
 2 #import "ViewController.h"
 3 #import "ViewController2.h"
 4 
 5 @interface AppDelegate ()
 6 @end
 7 
 8 @implementation AppDelegate
 9 
10 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
11     _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
12     _tabBarController = [[UITabBarController alloc] init];
13     ViewController *tab1 = [[ViewController alloc] init];
14     ViewController2 *tab2 = [[ViewController2 alloc] init];
15     [_tabBarController setViewControllers:@[tab1, tab2] animated:NO];
16     
17     _window.rootViewController = _tabBarController;
18     [_window addSubview:_tabBarController.view];
19     [_window makeKeyAndVisible];
20     
21     return YES;
22 }
23 
24 - (void)applicationWillResignActive:(UIApplication *)application {
25 }
26 
27 - (void)applicationDidEnterBackground:(UIApplication *)application {
28 }
29 
30 - (void)applicationWillEnterForeground:(UIApplication *)application {
31 }
32 
33 - (void)applicationDidBecomeActive:(UIApplication *)application {
34 }
35 
36 - (void)applicationWillTerminate:(UIApplication *)application {
37 }
38 
39 @end